不同扰流内构件强化管式反应器传质性能的研究

采用NaOH-CO₂-H₂O体系，研究了4种不同扰流内构件及其组合型式对管式反应器传质性能的影响。以气相体积总传质系数KGaV作为衡量传质效果的评价指标，考察了液体流量L、气体流量G、不同扰流内构件及其组合型式对K_Ga_V的影响。结果表明，K_Ga_V随着液体流量增大而提高，气体流量的变化对K_Ga_V的影响较小；中心扰流内构件和管壁扰流内构件的加入，有效地提高了管式反应器的K_Ga_V；与空管相比，中心扰流内构件加入后管式反应器的K_Ga_V提高了8%~47%，管壁扰流内构件加入后K_Ga_V提高了15%~46%，中心与管壁组合扰流内构件加入后K_Ga_V提高了19%~65%；通过比较4种扰流内构件对K_Ga_V的影响可知，U型叶扇的传质强化效果最好，平面叶片的传质强化效果最差。

The mass transfer enhancement of a tubular reactor with different inserted components

The chemical absorption of CO₂by an aqueous solution of NaOH has been employed to investigate the mass transfer performance in a tubular reactor with four different inserted components. The effects of combinations of the four inserted components on the mass transfer performance were also studied. The volumetric overall mass transfer coefficients (K_Ga_V) for the tubular reactor were evaluated with the liquid flow rate and gas flow rate as operating variables. The experimental results showed that K_Ga_V increased with the increase of the liquid flow rate while the gas flow rate had a negligible effect on K_Ga_V. The inserted components could increase the values of K_Ga_V of the tubular reactor and greatly intensify the mass transfer process. The K_Ga_V values of the tubular reactor with central components, tube wall components and their combinations were higher than those of the tubular reactor with no inserted components by 8%-47%, 15%-46% and 19%-65%, respectively. Comparison of the overall performance of the four inserted components suggests that in terms of K_Ga_V values, insertion of the U-blades in the tubular reactor offered the best mass transfer enhancement while flat blades offered the worst mass transfer enhancement.